It has been a very wet few days in the Stateline with the steady rainfall Thursday morning followed by intense thunderstorms Thursday evening. Between those two rounds, many locations in the Stateline picked up between 1.5-4" of rainfall in less than 48 hours with more on the way Friday night.
Additional rounds of heavy rain will be possible tonight, promoting a risk for more flooding. Scattered thunderstorms will increase in coverage through the evening, with the main round coming between 10PM-2AM. There is also a low-end severe weather risk with some of these storms, with large hail being the primary concern.
Heavy rain will continue through about 1-2AM for most of the area before winding down overnight. Scattered showers will persist in some form through about 8-9AM, but with much less intensity.
With the additional storms, another 1-2" of rain may come down where strongest thunderstorms track. Flash flooding and river flooding may become a concern with already very saturated soils considering the rain from the day before. This will not be widespread 1-2" for everyone, but isolated narrow bands where thunderstorms track over the same areas could realistically see another couple inches of rain fall.
An areal flood watch is now in effect through Saturday morning for North-Central and Northeastern Illinois. Most of the heaviest rain from Thursday came down across parts of these counties, meaning the ground is already saturated. Additional rainfall will quickly turn to runoff and flood low-lying areas.
And a river flood warning is in effect for the Kishwaukee river South of Rockford through Sunday morning. The river flood gauge near Perryville Road was approaching minor flood stage and is forecast to surpass that mark with the additional rainfall tonight.
Areal flooding, river flooding, and flash flooding are all on the table tonight with the heavy rainfall set to move in. Be sure to heed any flash flood warnings and avoid driving through flooded roadways.
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